One: section steel. According to the cross-sectional shape, it can be divided into round steel, flat steel, square steel, hexagonal steel, octagonal steel, angle steel, I-beam, channel steel, T-beam, B-beam, etc. Two: Steel plate! According to the thickness, there are thick steel plates (thickness $% mm) and thin steel plates (thickness!% mm). According to the purpose, they are divided into general steel plates, boiler steel plates, shipbuilding steel plates, automobile thick steel plates, general thin steel plates, and roofing Thin steel plates, pickled thin steel plates, galvanized thin steel plates, tinned thin steel plates and other special steel plates, etc. Three: Steel strips are divided into hot-rolled steel strips and cold-rolled steel strips according to their delivery status. Four: Steel pipes! Divided by manufacturing methods Seamless steel pipes (hot-rolled and cold-drawn) and welded steel pipes are divided into general steel pipes, water gas steel pipes, boiler steel pipes, petroleum steel pipes and other special copper pipes according to their purposes.# According to their surface conditions, they are divided into galvanized steel pipes and Non-galvanized steel pipes are divided into threaded steel pipes and non-threaded steel pipes according to the pipe end structure. Five: Steel wire! According to the processing method, it can be divided into cold drawn steel wire and cold rolled steel wire. According to the purpose, it can be divided into general steel wire, wrapping steel wire, overhead communication steel wire, welding steel wire, spring steel wire, piano steel wire and other special steel wires, etc.# by surface The conditions are divided into polished steel wire, polished steel wire, pickled steel wire, smooth steel wire, black steel wire, galvanized steel wire and other metal steel wires. Six: Steel wire rope! According to the number of strands, it is divided into single-strand steel rope, six-strand steel rope and eighteenth. 'Strand steel rope, etc.' are divided into organic core steel rope and metal core steel rope according to the inner core material. According to the surface condition, they are divided into non-galvanized steel rope and galvanized steel rope.